Get instant feedback while coding. Pyrefly processes 1.8M lines per second, adds smart imports, and supports Visual Studio Code and NeoVim.

We're living through one of the strangest inversions in software engineering history. For decades, the goal was determinism; building systems that behave the same way every time. Now we're layering ...

Get better AI workflows now, including agent mode for refactors. The green build supports OpenAI-compatible endpoints and local servers.

Jupyter is a way of creating interactive notebooks that blend text, graphics, and code. This is a unique form of programming.